fix: user roles take single string & DDL readPreference tests

NODE-2832

.gitignore

@@ -47,3 +47,5 @@ build/Release
 node_modules
 yarn.lock
 
+.vscode
+output

lib/operations/add_user.js

@@ -22,7 +22,9 @@ class AddUserOperation extends CommandOperation {
     const options = this.options;
 
     // Get additional values
-    let roles = Array.isArray(options.roles) ? options.roles : [];
+    let roles = [];
+    if (Array.isArray(options.roles)) roles = options.roles;
+    if (typeof options.roles === 'string') roles = [options.roles];
 
     // If not roles defined print deprecated message
     // TODO: handle deprecation properly

test/functional/collection.test.js

@@ -1,11 +1,9 @@
 'use strict';
-const Topology = require('../../lib/core/sdam/topology').Topology;
 const setupDatabase = require('./shared').setupDatabase;
 const chai = require('chai');
 const expect = chai.expect;
 const sinonChai = require('sinon-chai');
 const mock = require('mongodb-mock-server');
-const ReadPreference = require('../../lib/core/topologies/read_preference');
 chai.use(sinonChai);
 
 describe('Collection', function() {
@@ -1309,42 +1307,4 @@ describe('Collection', function() {
       });
     }
   });
-
-  context('DDL methods with serverSelection readPreference primary', () => {
-    const collectionMethodSet = {
-      createIndex: [{ quote: 'text' }]
-    };
-
-    Object.keys(collectionMethodSet).forEach(operation => {
-      it(`should ${operation} with serverSelection readPreference primary`, {
-        metadata: {
-          requires: { topology: 'replicaset' }
-        },
-        test: function(done) {
-          const opArgs = collectionMethodSet[operation];
-          const configuration = this.configuration;
-          const client = configuration.newClient(configuration.writeConcernMax(), {
-            useUnifiedTopology: true,
-            readPreference: 'primaryPreferred'
-          });
-          client.connect((err, client) => {
-            expect(err).to.not.exist;
-            const db = client.db(configuration.db);
-            const collection = db.collection('db-two');
-            const TopologySpy = this.sinon.spy(Topology.prototype, 'selectServer');
-            const callback = err => {
-              expect(err).to.not.exist;
-              expect(TopologySpy.called).to.equal(true);
-              expect(TopologySpy)
-                .nested.property('args[0][0].readPreference.mode')
-                .to.equal(ReadPreference.PRIMARY);
-              client.close(done);
-            };
-            opArgs.push(callback);
-            collection[operation].apply(collection, opArgs);
-          });
-        }
-      });
-    });
-  });
 });

test/functional/readpreference.test.js

@@ -1,10 +1,12 @@
 'use strict';
 
+const Topology = require('../../lib/core/sdam/topology').Topology;
 const test = require('./shared').assert;
 const setupDatabase = require('./shared').setupDatabase;
 const withMonitoredClient = require('./shared').withMonitoredClient;
 const expect = require('chai').expect;
 const ReadPreference = require('../../lib/core/topologies/read_preference');
+const { withClient } = require('./shared');
 
 describe('ReadPreference', function() {
   before(function() {
@@ -654,4 +656,74 @@ describe('ReadPreference', function() {
       })
     });
   });
+
+  context('should enforce fixed primary read preference', function() {
+    const collectionName = 'ddl_collection';
+
+    beforeEach(function() {
+      const configuration = this.configuration;
+      const client = this.configuration.newClient(configuration.writeConcernMax(), {
+        useUnifiedTopology: true,
+        readPreference: 'primaryPreferred'
+      });
+      return withClient(client, (client, done) => {
+        const db = client.db(configuration.db);
+        db.addUser('default', 'pass', { roles: 'readWrite' }, () => {
+          db.createCollection('before_collection', () => {
+            db.createIndex(collectionName, { aloha: 1 }, done);
+          });
+        });
+      });
+    });
+
+    const methods = {
+      'Collection#createIndex': [{ quote: 'text' }],
+      'Db#createIndex': [collectionName, { quote: 'text' }],
+      'Db#addUser': ['thomas', 'pass', { roles: 'readWrite' }],
+      'Db#removeUser': ['default'],
+      'Db#createCollection': ['created_collection'],
+      'Db#dropCollection': ['before_collection'],
+      'Collection#dropIndex': ['aloha_1'],
+      'Collection#rename': ['new_name'],
+      'Db#dropDatabase': []
+    };
+
+    Object.keys(methods).forEach(operation => {
+      it(`${operation}`, {
+        metadata: {
+          requires: { topology: ['replicaset', 'sharded'] }
+        },
+        test: function() {
+          const configuration = this.configuration;
+          const client = this.configuration.newClient(configuration.writeConcernMax(), {
+            useUnifiedTopology: true,
+            readPreference: 'primaryPreferred'
+          });
+          return withClient(client, (client, done) => {
+            const db = client.db(configuration.db);
+            const args = methods[operation];
+            const [parentId, method] = operation.split('#');
+            const collection = db.collection(collectionName);
+            const parent = parentId === 'Collection' ? collection : parentId === 'Db' ? db : null;
+            const selectServerSpy = this.sinon.spy(Topology.prototype, 'selectServer');
+            const callback = err => {
+              expect(err).to.not.exist;
+              expect(selectServerSpy.called).to.equal(true);
+              if (typeof selectServerSpy.args[0][0] === 'function') {
+                expect(selectServerSpy)
+                  .nested.property('args[0][1].readPreference.mode')
+                  .to.equal(ReadPreference.PRIMARY);
+              } else {
+                expect(selectServerSpy)
+                  .nested.property('args[0][0].readPreference.mode')
+                  .to.equal(ReadPreference.PRIMARY);
+              }
+              done();
+            };
+            parent[method].apply(parent, [...args, callback]);
+          });
+        }
+      });
+    });
+  });
 });